package tech.turl.community.service;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
import tech.turl.community.dao.UserMapper;
import tech.turl.community.entity.LoginTicket;
import tech.turl.community.entity.User;
import tech.turl.community.util.CommunityConstant;
import tech.turl.community.util.CommunityUtil;
import tech.turl.community.util.MailClient;
import tech.turl.community.util.RedisKeyUtil;

import java.util.*;
import java.util.concurrent.TimeUnit;

/**
 * @author 
 * @date 2021/03/15
 */
@Service
public class UserService implements CommunityConstant {
    @Autowired private UserMapper userMapper;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired private TemplateEngine templateEngine;

    @Autowired private MailClient mailClient;

    //    @Autowired
    //    private LoginTicketMapper loginTicketMapper;

    @Autowired private RedisTemplate redisTemplate;

    public User findUserById(int id) {
        //        return userMapper.selectById(id);
        User user = getCache(id);
        if (user == null) {
            user = initCache(id);
        }
        return user;
    }

    /** 注册 */
    public Map<String, Object> register(User user) {
        Map<String, Object> map = new HashMap<>(16);
        // 空值处理
        if (user == null) {
            throw new IllegalArgumentException("参数不能为空！");
        }
        if (StringUtils.isBlank(user.getUsername())) {
            map.put("usernameMsg", "账号不能为空");
            return map;
        }
        if (StringUtils.isBlank(user.getPassword())) {
            map.put("passwordMsg", "密码不能为空");
            return map;
        }
        if (StringUtils.isBlank(user.getEmail())) {
            map.put("emailMsg", "邮箱不能为空");
            return map;
        }

        // 验证账号
        User u = userMapper.selectByName(user.getUsername());
        if (u != null) {
            map.put("usernameMsg", "该账号已存在！");
            return map;
        }
        // 验证邮箱
        u = userMapper.selectByEmail(user.getEmail());
        if (u != null) {
            map.put("emailMsg", "该邮箱已被注册！");
            return map;
        }

        // 注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0, 5));
        user.setPassword(CommunityUtil.md5(user.getPassword() + user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID());
        user.setHeaderUrl(
                String.format(
                        "http://images.nowcoder.com/head/%dt.png", new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);

        // 激活邮件
        Context context = new Context();
        context.setVariable("email", user.getEmail());
        // http://localhost:8080/community/activation/101/code
        String url =
                domain
                        + contextPath
                        + "activation/"
                        + user.getId()
                        + "/"
                        + user.getActivationCode();
        context.setVariable("url", url);
        String content = templateEngine.process("/mail/activation", context);
        mailClient.sendMail(user.getEmail(), "激活邮件", content);

        return map;
    }

    public int activation(int userId, String code) {
        User user = userMapper.selectById(userId);
        if (user.getStatus() == 1) {
            return ACTIVATION_SUCCESS;
        } else if (user.getActivationCode().equals(code)) {
            userMapper.updateStatus(userId, 1);
            clearCache(userId);
            return ACTIVATION_SUCCESS;
        } else {
            return ACTIVATION_FAILED;
        }
    }

    /**
     * 登录
     *
     * @param username 用户名
     * @param password 密码
     * @param expiredSeconds 凭证过期时间 秒
     * @return
     */

    public Map<String, Object> login(String username, String password, int expiredSeconds) {
        Map<String, Object> map = new HashMap<>(16);

        // 空值处理
        if (StringUtils.isBlank(username)) {
            map.put("usernameMsg", "账号不能为空！");
            return map;
        }
        if (StringUtils.isBlank(password)) {
            map.put("passwordMsg", "密码不能为空！");
            return map;
        }
        // 验证账号
        User user = userMapper.selectByName(username);
        if (user == null) {
            map.put("usernameMsg", "该账号不存在！");
            return map;
        }

        // 验证状态
        if (user.getStatus() == 0) {
            map.put("usernameMsg", "该账号未激活！");
            return map;
        }
        // 验证密码
        password = CommunityUtil.md5(password + user.getSalt());
        if (!user.getPassword().equals(password)) {
            map.put("passwordMsg", "密码不正确！");
            return map;
        }

        // 生成登录凭证 session
        // HTTP 无状态

        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis() + expiredSeconds * 1000));
        //        loginTicketMapper.insertLoginTicket(loginTicket);

        String redisKey = RedisKeyUtil.getTicketKey(loginTicket.getTicket());
        // loginTicket会序列化成json
        redisTemplate.opsForValue().set(redisKey, loginTicket);

        map.put("ticket", loginTicket.getTicket());
        return map;
    }

    public void logout(String ticket) {
        //        loginTicketMapper.updateStatus(ticket, 1);
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        LoginTicket loginTicket = (LoginTicket) redisTemplate.opsForValue().get(redisKey);
        loginTicket.setStatus(1);
        redisTemplate.opsForValue().set(redisKey, loginTicket);
    }

    /**
     * 通过ticket查询LoginTicket对象
     *
     * @param ticket
     * @return
     */
    public LoginTicket findLoginTicket(String ticket) {
        //        return loginTicketMapper.selectByTicket(ticket);
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        return (LoginTicket) redisTemplate.opsForValue().get(redisKey);
    }

    /**
     * 更新头像
     *
     * @param userId
     * @param headerUrl
     * @return
     */
    public int updateHeader(int userId, String headerUrl) {
        //        return userMapper.updateHeader(userId, headerUrl);
        int rows = userMapper.updateHeader(userId, headerUrl);
        clearCache(userId);
        return rows;
    }

    /**
     * 通过用户名查找用户
     *
     * @param username
     * @return
     */
    public User findUserByName(String username) {
        return userMapper.selectByName(username);
    }

    /**
     * 1.优先从缓存中取值
     *
     * @param userId
     * @return
     */
    private User getCache(int userId) {
        String redisKey = RedisKeyUtil.getUserKey(userId);
        return (User) redisTemplate.opsForValue().get(redisKey);
    }

    /**
     * 2.取不到时初始化缓存数据
     *
     * @param userId
     * @return
     */
    private User initCache(int userId) {
        User user = userMapper.selectById(userId);
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.opsForValue().set(redisKey, user, 3600, TimeUnit.SECONDS);
        return user;
    }

    private void clearCache(int userId) {
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.delete(redisKey);
    }

    /**
     * 获得用户权限
     *
     * @param userId
     * @return
     */
    public Collection<? extends GrantedAuthority> getAuthorities(int userId) {
        User user = this.findUserById(userId);

        List<GrantedAuthority> list = new ArrayList<>();
        list.add(
                () -> {
                    switch (user.getType()) {
                        case 1:
                            return AUTHORITY_ADMIN;
                        case 2:
                            return AUTHORITY_MODERATOR;
                        default:
                            return AUTHORITY_USER;
                    }
                });
        return list;
    }

    /**
     * 更新密码
     *
     * @param id
     * @param newPassword
     * @return
     */
    public int updatePassword(int id, String newPassword) {
        clearCache(id);
        return userMapper.updatePassword(id, newPassword);
    }
}
